Weatherproof electric heater



um I

L. P. HYNES.

WEATHERPROOF ELECTRIC HEATER.

APPLICAT!0N FILED MAY 8. 1920.

Patented July 12,1921.

f f 25 INVENITOI? R form of my invention, reference may be had UNITEDSTATES PATENT oFricE,

LEE 1. HYNES, ALBANYQNEW YORK, ASSIg-NOR TO CONSOLIDATED CAR-HEATINGCOMPANY, OF ALBANY, NEW YORK, A. CORPORATION OF WEST VIRGINIA.

To all whom it may concern:

Be it known that I, LEE P. HYNES, a citizen of the United States,residing at Albany, in the county of Albany and State of New 5 York,have invented certain new and useful Improvements in WeatherproofElectric Heaters, the following being a full, .clear, and exactdisclosure of the one form of my invention, which I at present deempreferable.

'ment on thefelectric heater shown in the I patent of 'Boardm'an No.1,294,607, February 18th,1919. I *or'a detailed description of thepresent .tothe following specification 'and to the accompanying drawingsthereof, Wherein- Y Figure 1 is'a side elevation of my heater,

Fig. 2 is a longitudinal section,

Fig. 3 is a transverse section-on line B-B of Figs. '1 and 2 Fig. 4 is abracket for supporting one end. of the .porce lain core. i In theconstruction of electric heaters to be used under water or in snoworlother exposed places, like the heater of the Board man patent, it has.been. found difiicult to maintain the electrical connection with theheating coil, due'to thefact that insulation which is moisture-proofwill not stand heat, while heat-resisting insulation is. notmoisture-proof; My improvement for overcoming this difliculty residesprimarily in adding to such heater a cooling compartment or vestibulewhich is out 01f from the Y coil-containing part wherein the tempera- 40ture rises to 500 or 600 degrees and is also specially cooled byradiation. From this vestibule I extend through to the heater coils inthe coil-chamber wires which are bare, or insulated by heat-proofmaterial like asbestos and I extend outward fromv the vestibule into theatmosphere or the conduit 7 wires which are covered with moisture-proofinsulation such as rubber. By my arrangement the temperature in thevestlbule is so chamber that the "irubber covered wires therein can bemaintained withoutdeterioration while the bare or asbestos covered wiresMy inventionis designed as an improveforming a 7 part detail atillustrating thereduced below the extreme heat inthe coil- Specificationof Letters Patent. Patented July 12, 1921 Application fi led m s, 1929.Serial No. 379,811,

bule terminal posts at which the connection can be made between "theincoming moistureproof wires on the one hand and the heatproof wires onthe other hand, the latter being a permanent part of the apparatus. Further features of novel construction will be referred'to hereinafter.

Turning to the drawing, 8 represents a porcelain core or support onwhich are spi-' rally wound 1n grooves on the outer surface the heating"coil 19. Through the center of the core 8 passes a metal rod 4. On theleft end of the-core is a porcelain disk 9 and outside of that is aU-shaped bracket 11 which is built into the heater and insulated fromthe central rod 4 by a composition disk 12; which secures the bracket tothe disk 9, being held in place by a nut on rod 4. 'On

-the right end of the porcelain core is a square plate 10 of asbestosheld against the core by a nut 27. This plate 10 serves to center thecoreavith respect to the external casing. A metal tube 3 formsthe-casing which", at the left, abuts against a substantial head-plate 5with an interposed packing gasket 7. At the right end isv a similarheavy plate 5-'which is enlarged and hollowed outin a bulb shape to formthe low. temperature vestibule.

passed' through the two heads'and serve .to. draw them together againstthe opposite ends of ,the tubular casing 3, the packing gaskets 7 ofsheet copper or asbestos and graphite composition being interposed ateach end. To the head 5,at the left is secured the bracket 11 by meansof a screw 20.

The vestibule is shut off from the heating chamber by a wall 15of'asbestos layers External bolts 6'are through which pass two porcelainbushingss- 30, andv through these bushings two bare or asbestos-coveredwires C and D extend. In theheating-chamber Wire C is secured to theright end of the central rod 4 by v means of nut 28, while wire -Dconnects with the right terminal of the heating coil. At the oppositeend the centralrod 4; con-' nects with the other terminal of the coil.Within the vestibule the heat-proof wires C and D connect respectivelywith two'bin'ding posts 24 on an insulating plate 14 which is secured tothe inside wall of the, vestibule. Since the cubic capacity of thevestibule is small and its thick ,walls exposed on the out- Side to theair, water, snow orv other cooling medium, the te pe a ure thereinremains ing but are not capable of withstanding the much lower'than thatof the coil-chamber where-heat is being "constantly generated. Thevestibule is also shut off from the coil compartment by wall 15. Thatenables me to bring into'the vestibule rubber-covered wires such as arenecessary for waterproofhigh heat of the coil-chamber. In the rear ofthe vestibule is an opening into which a conduit may be screwed tightlycontaining- On the rubber-covered wires {l0 and All. the top of thevestibule is another opening .covered by a flanged nut .18 with awatertight gasket under the flange. By this means the waterproof wiresmay be passed through the conduit into the vestibule and then screwed tothe binding posts 24L bya screw driver inserted through the topholeaforesaid which-is perpendicular to the line of the enteringconduit. The heat-proof Wires C and D are sufiiciently removed from.

any metal so that even if they are bare their insulation is adequatelymaintained by the wall 15 through which they pass and by which they aresupported and also by the insulating plate 14 carrying the binding poststo which they are connected. They are also stiif and substantial enoughto preserve their shape so that there is no danger'of' their saggin downto touch the metal at any point.

the moisture-proof leading-in wires.

lVhat I claim as new and desire to secure by Letters Patent'is: V

1. A weatherproof electric heater comprising a casing forming a coilchamber, a

supplementary casing forming a low-tem-f perature chamber suitable formoistureproof vwires, a heat insulating partition betueen. the twochambers and a' heat-proof conductor :leading from the coil inthe-coilchamber through .said partition .to a terminal in thelow-temperature chamber.

2. A weatherproof electric heater comprising a casing'forming acoll-chamber, ,a

supplementary ca sing forming a low-temperature chamber suitable. formoisture- 'proof wiresfla heat insulating partition between the twochambers haying a sealed joint with-the casing, and a heat-proof 'con-'prising a casing'forming a coil-chamber, a

ductor' leading from the coil in the coilchamber through said partitionto aterminal in the low-temperature chamber.

3. A- weatherpr'oof electric heater comsupplementary casing forming alow-temperatnre casing suitablefor moisture-proof wires, aheat-insulating partition between .the two chambers separated from thecoil and its'core andv a heat-proof conductor 0 0 they are independentof any insulating coating such as is requlred for leading through saidpartition from the coil in the coil-chamber to a terminal in thelowtemperature chamber.

4:. A Weatherproof electric heater comprising a casing forming acoil-chamber, a supplementary casing forming a low-temperaturecasingsuitable for moisture-proof wires, a heat-insulating partition betweensaid chambers, a detached terminal block in said low-temperaturechamber, and a heat-proof conductor extending through said partition toconnect the coil in the coilchamber with a terminal on said block.

5. A weatherproof electric heater comprising a casing forming acoil-chamber, a supplementary casing forming a low-temperature casingsuitable for moisture-proof wires and having an end-opening for theprisingua tubular metal casing forming a coll-chamber, separateend-plates between which the said casingis clamped, one of saidend-plates"being extended to form a low-temperature casing suitable formoisture-proof Wires and a heat-insulating partition between the saidchambers. 8. A weatherproof electric heater com- '/prising a casingforming a coil-chamber, a coil therein, a core for the coil providedwith end-plates-separated fromithe ends of the chamber and centeredtherein, a heatinsulating partition forming one end of said chamber, asupplementary casing forming a low-temperature chamber suitable formoisits ture-proof wires on the outer side of said partition, and aheat-proof conductor ex.- tending through the, partition to connect thecoil with a terminal in said low-temperature 'chamber.-

9. A weatherproof electric heater comprising a thin metal tube forming acoilchamber, a separate. thick-walled' casing forming a low-temperaturechamber,aheatinsulatingpartition between the two chambers and means forclamping the said tube between the thick -walled casing and an oppositeend-plate.

Signed atAlbany, county of Albany, State of New York, this 1st day ofMay, 1920.

- LEE P. HYNES.

